Meringue cake is a perfect marriage between (pavlova-like) crunchy but soft, egg-white based cake, and smooth filling made out of whipped cream, butter, egg yolks and hazelnut. If you learn to make one cake in your ENTIRE life, this is it.
*If the cake breaks patch it up the best you can. If it breaks completely? Eat the crumbs and make the meringue again.